Bizarre sync problem on imported QT

[iamtenninjas]

I have a .mov file that plays in sync in Quicktime, but goes out by 4 frames when I import it. It starts in sync, and goes out somewhere between 6s and 16s (no audio in between so I can't determine exactly when). It remains out by the same amount throughout, so it can't be a pull-down issue (I tried adjusting these settings anyway, and it didn't help). I checked and my video sync offset is the same as it always is (I also tried setting this to 0, which didn't help). It's as if PT is adding 4 frames of silence to the audio on import. I've tried reimporting, and get the same issue each time.

System:
PT LE 8.0.3cs1, MBox 2
OS X 10.6.3
Mac Pro 2x 2.66 GHz Dual-Core Intel Xeon, 3 GB RAM
Session is on an internal SATA drive